JPS6185940A - Artificial valve for heart - Google Patents

Abstract

A heart valve prostheses (121) comprising a generally annular body (123) which has an interior surface (127) that defines a central passageway for blood flow therethrough, occluder means (125) supported on said body for alternately blocking and then allowing the flow of blood through said passageway in a predetermined direction, said occluder means (125) being formed with means at opposite locations in the periphery thereof that cooperate with complementary means interior of said annular body, and a pair of opposed seat means (161,163) provided on the interior surface (127) of an annular body (123), each of said seat means (161,163) having a surface which is generally that of a portion of a frustum of a cone so that when the periphery of the occluder (125) engages said pair of seat means (161,163) in the closed position a good seal is achieved therealong.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to prosthetic valves for the replacement of defective native heart valves, and in particular to valves with curved closure quadrants. The features may be applied to a prosthesis of a heart valve with one or more closed bottoms in the form of flat plate-like members.

BACKGROUND OF THE INVENTION Various types of cardiac prosthetic valves have been developed that provide hemodynamic support as a result of the pumping action of the heart, and in particular function as a reverse valve. In the past, heart valves were individually packaged in poles/cages#
Although there have been a variety of modern artificial stones, some have used a closed base, generally in the form of a temporary disc, with either a flat or curved shape. Bokros
No. 3,546,711 discloses a heart with a circular occlusion pivoted in a hinged pin cooperating with a pair of upright fins disposed on the downstream face of the occlusion. The valve is listed. Bokros U.S. Patent No. 4.17
No. 8,639 discloses a pair of plate-like members each having an ear extending from its image side flank pivoting in a spheroidal guide located in an orifice ring. Presenting bilobed ophthalmic heart valves. U.S. Pat. No. 3,445,863 discloses a planar sigma plate that serves a notch in its bony portion having proportions such that it interfits with an associated notch in the base ring formed from substantially the same material. It is disclosed that the heart shape has one or more closed portions. U.S. Pat. No. 4,225,980, made of metal with an oval-shaped occlusion having a radial notch extending radially inwardly from the inner surface of the orifice ring. discloses a heart valve. US patent! 4,078,
No. 268'1, a two-lobed plate-like square with a pair of semicircular closed parts having ears extending upward from the downstream surface of the fulcrum (9) so as to form a pivot point. is disclosed. U.S. Patent No. 4.1': I9. ! l) No. 43 has an obtuse-angled, semi-circular, closed-base female part whose shape is rounded on the surface, and the load is semicircular from the inner surface of the orifice ring Approximately a circle extending inward,
The two-leaf temporary square of the camp that received the pivot pin of Jibushi is presented. U.S. Patent No. 4.5B.

No. 216 has both of its local portions 1lIlI with an elongated protrusion extending inwardly from the surface of the orifice ring to provide a track for guiding the pivoting movement and displacement of the closed base. 1+ one or more occlusions with two incisions
It shows the enlarged heart and visceral valves.

As is clear from the above, as a variety of different heart valves are designed and as surgical techniques advance around the world, the functionality of such prostheses continues to improve throughout the history of use, with increasing numbers being used each year. Research continues into the design of heart valves that are relevant to t)h.

SUMMARY OF THE INVENTION The present invention includes a central section along one or more occlusions supported thereon for alternately closing and permitting blood flow in a predetermined direction, each substantially in the form of a check valve. blood flow of
The inner surface that defines L? The present invention provides a variety of improved cardiac prostheses having a generally generally annular neck. Notch means, which may have a rectangular shape, are formed at opposing positions on the outer periphery of the closure portion, and each notch means receives a pivot post protruding into the inner surface machining half-container 7i of the impaction body. . At the position of the first rule sword for each pivot pillar, this ■
There is a pair of stop devices providing a curved surface in an area adjacent the pivot post at a position radially inward from the end of the landing. These curved surfaces provide an opposing surface that cooperates with the pivot column in defining the opening and closing movements of the closing base.
Aircraft I4 is recommended as a slight fulcrum. These pivoting postwork stop devices are preferably formed as a unitary structure to avoid any intervening that would result in a stagnation area where the +m liquid would evaporate.

(Implementation y1]) The valve lI shown in @1 diagram! The inner surface 27 of the part 111 is provided with a pair of pivot parts that open and close to control the fluid flowing through the central passage or orifice. This is a heart valve 21 consisting of a square section or housing 26.

The annular portion 26 defines a central passage orifice, and t'L defines a central passage orifice.
Also called a ring. The normal flow rL of blood passing through the heart valve 21 is directed downward in the direction of the square shown in Figures 1 and 2, as indicated by the small arrow shown at the top of Figure 2. be. Of course, the valve 21 can operate in any direction and is not significantly affected by gravity. For this reason, the terms ``up 15 times'' and ``down direction'' as used hereinafter in the main text are used merely to facilitate explanation and understanding, and do not impose any restrictions on the operation of Shinichikuraben that will be explained from now on. It's not a thing.

As can be seen, the five-ring barrel 26 has a smooth outer surface 29 that is that of the side of an upright cylinder. Appropriate means such as a circumferential groove or a pair of flats may be used to connect the heart valve 21 to the heart tissue. It should be appreciated that, for ease, a mechanism is not normally provided for attaching the suture ring to the annular body. However, since the fitting ring and its attachment to the heart valve 21 do not form part of the invention, it has been omitted merely to facilitate the presentation of the particular components of the heart valve to which it pertains. There is. 1980 move 11
U.S. Patent No. 4,233.6ψ0 issued 18 months ago, →
Place the mating ring against the circumferential heart valve body.1'y5
The disclosure content of this U.S. patent is cited in the text for reference.

The hollow part 26 and the plate part 25 are made of a suitable material that is compatible with the body, has low thrombogenicity, and is resistant to the fatigue that may occur during the countless opening and closing operations of the plate part. It can be made from materials. The trademark [POC (1,1
In order to be able to see the RYITE u trademark rPYR (几ITE
The lower part of FIG. 7 shows the graphite-based pyrolytic carbon coating described above, which may have been overlaid with a suitable Vcm coating of pyrolytic carbon such as that sold under the trade name J. This C/F pyrolytic carbon exhibits compatibility with soaked plate molding and fatigue resistance.

The orifice ring 26 can be made in the same manner as expected coated with pyrolytic carbon, or preferably made from solid rPYROL I TEJ pyrolytic carbon. A preferred method for forming an orifice ring purely from pyrolytic carbon by coating the mandrel which is subsequently removed is described in U.S. Patent No. 0055406 AI, which is incorporated herein by reference.
Disclosed in the issue.

The illustrated plate-shaped portion 25 is flat and has a uniform thickness throughout. Each plate-shaped portion 25 is shown most clearly in FIG.
As shown in Fig. 6, when the plate-like parts forming a pair of straight parts 61 are placed in the closed position, the areas in which the two straight parts 61 come into contact with each other in a substantially surface-contact manner are connected to the downstream surface 66 of the plate-like part. It has a straight edge 61 with an angle If. Generally, this angle is approximately 1
It is within the range of 10 to 160° and depends on the orientation of the plate relative to the horizontal or transverse plane in the closed position shown in FIG. In the rainbow, each plate-like part 25 has an arc-shaped, approximately semicircular main part 65 (see FIG. 1), and a flat main part 65 at right angles to the upstream and downstream sides of the plate-like part. a pair of intermediate or transitional straight edges 67; Furthermore, each plate-shaped part 25 has a pair of notches 69 arranged on both sides thereof in the area of the straight-line bent side surface 67. As best shown in FIG. 8, this notch is generally rectangular in shape, with rounded edges rather than the acute angles found in all bone formations.

The inner surface 27 forming the passage of the line body 26 also has an upright circular shape for most of its longitudinal direction, but from this there is a support means for imposing and defining the movement of the plate-shaped portion 2b. A pair of diametrically flat flat f1. It is blocked by the portion 41. This support means is a core having a pair of pivot posts 46 which fit into the notches 69 and on which the stop fittings #45 and 47 are located. As you can see from the first villain (the machine that is being constructed), this ttil1
The stone wall of the surface part (the hill 45.47 protrudes from the pivot post 46 with a radius of 10,000 times).The pivot post 46 and the I
The stopper device neck of the 11-sided part is formed integrally with each other, and the entire support structure is made by machining the body of pre-formed pyrolytic carbon to a crossroads dimension. Most preferably, it is formed as an integral part of the body 26. Figure 4 VC shows the most difficult part, li
The reason for the fact that each of the 46 pillars has one pair, one pair, and one position is due to the fact that the two flat surfaces of each pivot pillar and the two sides of the pivoting pillars are different from each other, so it is called the side part of the upper body 46. ° Approximately upper surface 49a and approximately F
It has 4 sides b.

The plate-shaped portion 25 has a flat surface 41b; a thicker portion on the diametrically opposite side to be straightened has a notch and a flat surface 41b; It is recommended to properly assemble the I/C ring by deforming the ring appropriately by narrowing the I/C ring 26 in the hollow cylindrical portion of the ring 26 into the inner part 75. .Instead of narrowing, the relatively thick part can be stretched by external force.

The annular body 26, made entirely of pyrolytic carbon PYROL I TE, is resilient enough to allow this L12 expansion and return to its originally engineered configuration.

In the assembled heart valve 7'', the depth of the notch 69 is such that the force of the side edge surface 67 of the ♂-shaped portion is as shown in FIG. It is slightly longer than the entire length of the housing pillar 46 so as to be in contact with the housing pillar 46.

In the opening position shown in FIG. 2, the plate 25 is positioned at an angle of about 5 to 15 degrees with respect to the central gland of the valve passage, so that the upper edge surface of the notch 69 is also It comes into contact with the arcuate surface 49a of the pivot post 46 shown in the figure. The attitude of the plate-like part is maintained and regulated by bringing the downstream side face 66 of the plate-like part into approximately contact with the side face 56 formed in the stopper device 45 of the VC5 suction. The downstream side surface 62 of the lower part 25 and the upper i of the pivot post 46: t+ll +1
m 4 between the arcuate surface 5b formed at the front upper lL of the stopper 4 at a position midway between the downstream 1[1] surface 49b.
This means that there will be a 1-contact.

When the flow of blood in the downstream direction (in the downward direction shown in FIG. 2) stops when the sorption 6 of each ventricle ends with respect to the aortic valve, each ventricle sucks all the solid liquid from the atrium into the intraventricular vcp. It begins to relax, and as a result of the death, the back pressure that exists within the aorta attempts to force the extraction in a direction (downward in Fig. 2 and Fig. 6), causing the protrusion 25 to close. rock or pivot into position. The t-shaped part changes slightly to the upper blade and has a 1σ diameter, and as a result, the lower surface of the rectangular notch 6 comes into contact with the arcuate surface 4 of the pivot column, and the swing of Sakabushija Along with the contact between the upper r butt side 62 of the plate-shaped portion 25 and the arcuate surface b'D of the stopper j147, fJ? at these points. 'It's guided by touch, so it's easy to move.'

When the closed position is reached as shown in Figure 6, the plate-shaped portion 25
The circular arch 65 is in contact with the inner surface 27 of the impaction trunk. Therefore, the shape of the arcuate ridge 65 is approximately an elliptical cross-sectional shape, that is, the intersection of one surface and the upright enzumi, and the tube portion is closely contacted with the inner H-cylindrical ml. It is desirable to exhibit an oblique angle around 1 as shown in the figure (Fig. 7). - In all cases, as shown in Figure 6, contact occurs between the arcuate surface 55 of the stopper device 47 and the upstream side surface 62 of the plate portion, and the linear contact between the two plate portions 25 occurs. The fighting portions 61 are also brought into contact so that their surfaces are substantially in contact with each other. Lower a of the plate-shaped portion 25, 1)llll [ffi 65 t, 1lI
A pair of curved surfaces formed on the central stopper device 45 at a position directly above the pivot column 53 and thus located radially inward of the pivot post and intermediate the upstream and downstream arcuate surfaces 49a, 49b. There is also a slight contact in the darkness with the realm of 57.

When the pumping stroke occurs again, the pressure on the upstream side surface vc of the plate-shaped portion 25 immediately displaces the stopper device 45 at the entire center of the Φ-shaped portion, causing the plate to move as shown by the imaginary line in FIG. It is guided by the line tangent between the upstream side surface 66 of the shaped portion 25 and the curved surface 57, and the pivot point begins. Furthermore, l/C is slightly displaced so that VC contact occurs between the upper surface of the plate-like notch 69 and the arcuate surface 49a of the pivot post.

By forming the pivoting column 46 and the stopper device 45, 47 in one piece with each other, the joining part fuses into an arc, so that no sharp depressions or troughs are present, i.e. the beginning of condensation. There is no area with a radius of curvature smaller than about 0.2fl, which could lead to a pooling problem, and therefore, this technique is sometimes unnecessary for the guiding action of the end V'1 of the arcuate surface. Since it is possible to exhibit a smooth surface-to-plane surface +S, a substantive advantage can be obtained. Furthermore, the required smooth swing of the plate portion between the opening and closing positions wJl:! 4. It is even easier to calculate the radius of curvature of the pivot column 46 by L times 5. Therefore, these surfaces 49a
.

The focal point of the radius of curvature of the valley of 49b will lie beyond the center point of the pivot post, and may even lie opposite the pivot post tIll VC. By explaining the Φ-shaped part shown in Figure 6 and in the closed position of the mason, the arc-shaped surface 49a
Such a configuration between the upper end of the notch 69 and the 1st surface of the Hiratama that forms the upper end of the notch 69 creates a quick sharp and sharp center @+3! This produces a force which, in response to the beginning of the pumping stroke, tends to open the cell more rapidly. In addition to merging the 44 regions between adjacent surfaces, an edge streamline 1 is also obtained by forming an oblique lower surface 51 on the central stop device 45.

In summary, the integral pivot post and strut ζ device minimizes interference with the blood J
As a result of effectively cleaning the surface to avoid solidification, and providing a short pivot post 46 on the side with a stopper located on the left side projecting inward in the direction of the passage (vC), (f
The effective and certain IJ groan is due to the failure of the I-order's oscillations and military encouragement, and it not only acts as an elite surface, but also acts as a fulcrum that supports the central #I movement. . Figure 4 and Figure 8? - Firstly, I will explain l/cL, which is probably the most mechanical process.The plate-shaped part around 49a as a fulcrum, iK, 41, is mainly a transfer operation that involves minimal sliding movement. However, this must continue to operate satisfactorily for several years. Fatigue in this process? It is important to reduce the The ability to fuse the pivot post with the stopper stem, due to their monolithic nature, seeks to avoid small cracks and valleys that may promote blood coagulation. The contact between the pivot column and the stopper provides the overall strength of the structure without having to incur the disadvantage of having to precisely align components that are machined on one side in order to achieve this. I recommend using it as OT Noh. ζ shown in Figures 1 to 15,
Single flat fL closed base mouth B rounded annular body 1 configured to operate in conjunction with disc portion 12b; heart valve 1z1
She is another real sister of . In general, the design principles described in detail so far and 151 for the two-ring temporary section 21 are applied.
I used a number 100 Kaijiho number in the explanation of Seisomoto. Furthermore, unless otherwise indicated below, the function and structure of corresponding components are substantially the same as previously described.

The annular space 126 is a passage Wtl through which blood flows.
The inner surface 127'f that defines the orifice! : and is shown as having a smooth outer circular concave surface 129 for the reasons mentioned above. The inner surface 127 includes an inwardly extending land portion 161.1 in which the arcuate bony portion of the disc occlusion 125 can be securely placed, as described in detail below.
63 is provided, which is different from the two-ring type valve.

Closed section 125, generally upstream side 162 and bottom d 11
It has the form of a flat disk with 111 faces and 166 faces.

The local portion of this disk portion includes a small circular arc portion 161, a large circular arc portion 135, and a pair of straight parallel intermediate portions 167 arranged at opposing positions. A notch 169 having a substantially semicircular shape is arranged in the @ area of the four linear parts 167. The shape of the large and minute circular arc section 165 is approximately that of a part of an ellipse, and the shape of the small circular arc dog bone @ 161 is also approximately that of a part of an ellipse that has a very short short point.

@ Figure 16 shows the Hinamo Ku (In the work shown, the middle bone part is the same as the valley - the skillful Naoyama direction on the Naotsuki) 11.4 and 138
The gluttony part of the surface is also returning inward from the extension of the external force. Figure 12 VC City I3 (As shown, the circular circular part is also drawn from 'fcJJζmin)'. I'm so hopeful.

(■Applying device and stopper device/) Temple J defeat also -
With regard to the 7"-sized freeze-thickness 26 shown in Figure 81 to Width 6, it was not desirable to form it integrally as a part of the annular body 126 for the reasons stated in @, but this D configuration There are some differences in the design due to the concept of occlusion.11 parallel flat @ in the opposite position within the annular body of the internal measurement passage of the approximately circular cross section and the curved section. Instead of forming a region,
In providing a pair of protrusions 140 extending from the inner surface of the annular body 16 and providing a flat surface 141 arranged to control l-close!
The improved guiding action of the second part is improved by the samurai. This protrusion 14
0 2 @ 14 Parallel to the fL cardinal axis 'f!
, substantially perpendicular to the path direction of the curved path.

Projecting radially inwardly from each of these flat surfaces 141 is a pivot post 146 and a pair of stop devices 145.
It is 147. The pivot column 146 is similarly formed with a focal point of the radius of curvature located beyond the center point of the pivot point and, if necessary, beyond the opposite face of the column for the purpose stated in #. Arc-shaped approximately upper and lower rjB149a, 149b
has.

The annular body 121 is suitably expanded as described above to snap the closure 125 into place in the notch 169 that fits around the pivot post 146. As previously stated, the length of pivot post 146 is.

The flat bottom surface 167 of the closed portion is the flatness of the protrusion! fi
141 to provide a support surface during pivoting between the open and closed positions. (Furthermore, each protrusion 140 is formed with a curved lower surface 150 that is traced by the pivot @1 cliff transition surface 168.

In the open position, as shown in dotted lines in FIGS. 11 and 14, the closure is inclined within a range of approximately 5 to 15 degrees relative to the centerline of the passageway, e.g.

When the top surface of the notch 169 is in contact with the top surface 149a of the pivot column, the stopper is located approximately 100 Li in front of the surface 1b6 that has been turned 75 times out of ff1145. -1,ta,
Upper a of the closed part 1) Contact should also occur between the Il1 surface 162 and the upper part I/flange part A 147.

As soon as the ventricle (ventricular) five-stroke (lighting on the box located at the aorta position) stops, the flow of back pressure pushes up the closed section 12'D, and as a result, the surface of the notch 169 moves up to the cardinal seat q. Arc-shaped surface 14
9b, upstream +1 + 11111i 1, phosphorus is connected to the upstream 1st rule and downstream 1st rule surface 14 soa, 14 of the pivot column 146
94), it comes into contact with the curved surface 15b formed on the stopper 147, but both of the surfaces 14b guide the pivoting movement. While the pivoting movement to the intermediate position i4 continues, the curved surface 150 of the protrusion, which is 166, is traced as the actual VC. Closed part 4 12
5 reaches the fully closed position of 7"L (see dotted line rAJ in Figure 414), its large arcuate dog-bone portion and small arcuate dog-bone portion "" protrude inwardly from the annular body 126. There is a pair of approximately semicircular width portions 161 and 163 formed as part of the portion, and a second bullet. Because each of these seats has a generally conical or beveled configuration, the notches 16
As long as there is a gap in 9, self-up and out movement of the obstructed part will occur, and a line contact will occur between the trough part of the closing part and the single blade of the surface of the seat part, so that the heart valve will close. Provides a more secure seat around the periphery of the closure when in position. These constant characteristics due to fL's unique self-centering action are approximately part of the surface of a truncated cone whose upper part is conical and the other seven have a conical lower part. 1 with table 11ili which is
Providing a pair of rotating arm seats is also applicable to other heart valve structures.

When the ventricle begins to contract again and restarts the next pumping stroke, the pressure on the upstream measuring surface 162f starts the pumping, and the flow of blood moves the obstructed part 125 slightly to the side of F.
As a result, the upper peak of the notch comes into contact with the upper arcuate surface 149a of the pivot point, and this pivot point (also located between the upstream and downstream surfaces 149a and 149b) ) A pivoting path from the closed 24 position to the open position 1 = ti is defined along the curved upper surface 157 formed on the lower stopper device 145. In Figure 14, the middle position and
The change is indicated by a solid line, and when the bottom surface 166 of the V is closed and the bottom surface 166 of the curve is fully opened, as shown by the dotted outline rBJ in FIG. The Tokidoba/FJJJ movement ends. ko//) place 1e
In Figure 11, only the construction 1L2 pivot 71 and the stopper device shown in Fig. 11 protrude into the curved grass, and the surface 1b of the protrusion Another empty area adjacent to the mouth further reduces the resistance to flow through the valve, resulting in better flow through the central Ij!! tract of the heart valve.

Similar to the two-ring temporary stop valve 21, the streamlined shape of the integral pivot pillar and stopper fitting 7) Smooth, first
As can be seen, only a small amount of disturbance occurs to the flow flowing through the central path A in Figure 0. Due to this integral structure, one curved surface is adjacent to the rainbow 4
This prevents the formation of cracks and troughs that merge into curved surfaces and allow the liquid I'Iu to stagnate there, thereby promoting solidification.

Although the invention has been described in terms of two preferred embodiments, it will be apparent to those skilled in the art that many modifications and variations may be made without departing from the scope of the invention as defined in the appended claims. It should be understood that modifications are possible. For example, many uninvented slashes? With respect to these features, the occlusion need not be flat and may have a curved cross-section, similar to the features found in many prior art heart valve structures. The specific features of the invention are set forth in the appended claims.

[Brief explanation of drawings]

Figure 1 is a perspective view of a two-ring plate-shaped heart valve shown in the open position embodying the features of the present invention;
, l 2-2 is an enlarged sectional view, and FIG. 6 is a partial view 1 similar to FIG. 2 showing the slope in the closed position! Figure 4 shows the approximate position that the temporary part can take during opening and mold movement, and a partial view similar to Figure 6 of the orifice ring indicating the temporary part, Fig. 7 is a partial plan view of the 7" orifice ring shown in Fig. 4. Fig. 6 is a partial cross-sectional view taken along line 6-6 in Fig. 5. Figs. 6J!i, a side view showing one side of the plate-shaped shank of the sashimi-tomo cage,
A partial cross-sectional view of line 8-8 in Figure 8, Figure 21, and Figure 9.
Figure 10 is a perspective view of another embodiment of a sleeve III part suitable for use as part of a single-closed-base heart cell; Figure 10 is a partial plan view of the annular body shown in Figure 9 , 1st
Figure 1 is a perspective view of the heart valve showing the annular body of Figure 7 when the closed part is fully opened, and Figure π12 is the first closed ring part of the prone deaf with a part cut away to show its internal structure. side view, 1st
Figure 6 shows a partial front view of the closing part, and Figure 14 shows the intermediate position when the closing part is moving to the closed position with a solid line, and also shows the position taken in the opening position, closing position, and standing position. It is a cross-sectional view of the heart valve shown by the dotted line, and an enlarged partial view showing the inner surface of the ring for adjusting the heart valve. , 26... orifice ring,
25...closed part, 27...inner surface of square 11 part, 2so...smooth outer surface, 61...straight iJ @ evil,
62...Upstream side. 66...lower side of f-shaped part, 6b...main toner part, 67...-side side surface part, 69...notch, 41...
Flat part, 43... Pivot column, 45.47... Stopper device, b6... Il1 surface part, 55... Arc-shaped surface, 57
...curved surface, slanted downward surface around 59...1. (5 people outside)

Claims (1)

[Scope of Claims] 1. A generally annular body having an inner surface defining a central passageway for blood to flow therethrough and alternately stopping the flow of blood through said passageway in a predetermined direction; and an occlusion means supported on the body for permitting the cough occlusion means to be formed with aligned notch means at opposing positions on its periphery and extending generally radially from the inner surface of the body. A pair of aligned pivot posts projecting from the inner cutter are provided, the posts having arcuate opposed side faces and sized to be received within the notch means. stopper means protruding inwardly from the inner surface at substantially lateral positions of each pivot post and extending further radially inwardly than the pivot post; a pair of curved surfaces are provided in an area adjacent to the post, each curved surface providing a fulcrum located at an opposite position that alternately assists in defining the opening and closing movement of the closure means; The artificial heart valve is located in a region radially inward in the middle of the arcuate side portions of the columnar body at the opposing positions. 2. The artificial heart valve according to claim 1, wherein the stopper means is formed integrally with the pivoting column. 3. The artificial heart valve according to claim 2, wherein the curved surface of the stopper means is fused to the arcuate side surface of the pivoting column. 4. Claim 3, characterized in that the stopper means and the pivot column are integral with the annular trunk.
Artificial heart valve as described in Section. 5. The artificial cardiac valve according to claim 2, wherein a focal point of each curved surface of the pivoting column is located at a center point of the pivoting column. 6. The closure means is a single piece having a pair of opposed linear circumferential sections in which said notch means are respectively located, separated by a distance less than the diameter of the center connection of a generally circular cross section. The artificial heart valve according to claim 1, characterized in that it is a disk. 7. said pivoting post and said stop means having said closing base means having a generally semi-circular large circumferential section and a smaller substantially shorter circumferential section terminating in said pair of opposing linear circumferential sections; projecting from a pair of protrusions located primarily on one side of the diameter of the passageway so as to have an arcuate portion, and the circumferential section further being colinear and continuous with both ends of the large circumferential section; 7. A prosthetic heart valve as claimed in claim 6, characterized in that it terminates in a pair of sections at right angles thereto. 8. Each of the protrusions has a curved surface facing substantially downstream,
8. A prosthetic heart valve as claimed in claim 7, characterized in that one of said right-angled sections adjacent thereto moves during the opening and closing movement of said closure means. 9. The closure means includes a pair of generally semicircular or semielliptical disks, each of which has a straight edge portion, a large arcuate edge portion, and a substantially circular edge portion in which the cutout means is respectively disposed. 2. The artificial heart valve according to claim 1, wherein the artificial heart valve has a peripheral portion including diametrically opposed straight sections. 10. a generally annular body having an inner surface defining a central passageway through which blood flows, and an occlusion means supported by the body that alternately stops and permits the flow of blood within said passageway in a predetermined direction; and a pair of closure means provided on the inner surface of the annular body, the closure means being formed with means cooperating with associated means on the inside of the annular body at opposite positions of its periphery; Seat means in opposing positions are provided, each of said seat means being arranged such that a good seal is obtained therealong when the periphery of said closure means engages said pair of seat means in the closed position. An artificial heart valve characterized by having a surface that is approximately a part of a truncated cone.